Presentation on theme: "Draft Design Guidelines to Accommodate Peds and Bikes at Interchanges Meghan Mitman Fehr & Peers August 15, 2011."— Presentation transcript:
Draft Design Guidelines to Accommodate Peds and Bikes at Interchanges Meghan Mitman Fehr & Peers August 15, 2011
Where does the Freeway end?
Leaving the Freeway, Entering a Neighborhood
Dashed bike lane begins before on ramp lane; optional exit ramp Directional curb ramps with truncated domes, high visibility striping provided for all crosswalks Landscape buffer provided between sidewalk and bike lanes, including on the structure as feasible Crosswalk located in location with lowest speed and highest visibility Ramp geometrics minimize speed for vehicles leaving the arterial
HOV Lane added downstream of crosswalk
Bike weaving zone provided through long on-ramp
Advance yield limit line provided on dual lane crossing (advance stop bar if signalized). Bicyclists have option to use crosswalk (with ramps). Raised (landscaped) buffer provided between bike lane and on- ramp lanes
Ramp geometrics minimize speed for vehicles leaving the freeway. Ramp is stop controlled.
Optional bicycle exit ramp
Bike lane crossing - detail
In this configuration, ramps should be signalized. Bicycle detection and optional ramps accommodate bikes at the crosswalk.
Advance yield limit line is provided across dual lane ramp. Advance stop bar if signalized.
Source: FHWA Solution: Two-step crossing (one step during vehicle phase 2 and the other during vehicle phase 3) Possible ped crosswalks Vehicle phase 1 Vehicle phase 2 Vehicle phase 3 With most SPUIs there is never a phase when pedestrians can cross the urban arterial without conflict
Each stage is coordinated with the downstream signal in the same direction
Source: FHWA Possible ped crosswalks Vehicle phase 1 Vehicle phase 2 Vehicle phase 3 Peds with vehicle phase 2 Peds with vehicle phase 3
Skip Striping through Complex Intersections
Advance crosswalk controlled with a signal or HAWK beacon
Determining Crosswalk Treatments
Note: Spreadsheet should supplement engineering judgment and should be used in conjunction with treatment fact sheets per NCHRP Report 562. Credit: Fehr & Peers, April Version 1.02
Thank You! Meghan Mitman
High Speeds, Poor Visibility
Prefer Slow Speed, Right Angle Urban Designs
Source: FHWA Flat angle = wide crossing & high-speed turns Tight angle = short crossing & slow speed turns Springfield OR Old ramp alignment Positive example: reconfigured ramp terminus
Source: FHWA Red line = old crosswalk Red line = old crosswalk Green line = new crosswalk Green line = new crosswalk Springfield OR
Savings in Land Area, Less Ped Dead Zone
What you dont see in this presentation… Right turn lane adjacent to shared right-thru